Chainsaw Man is gonna end super fucking abruptly; next chapter is the final one and there are still like a dozen unresolved plot threads. Unless there's going to be a part 3, but I doubt that; Fujimoto said in a past interview that he hates doing serialized manga and prefers doing big oneshots.
The main problem with part 2, I think, is that Fujimoto had too many ideas. If the story had just stuck to the conflict with Yoru, the Nayuta slice-of-life, Yoshida being a POS and Denji's personal conflict with Public Safety, the story would have been much more coherent. All the stuff with Fami, Liitle D, the student council niggers, the Fire Devil and the Fake Chainsawmen, and the Hybrid Devils being prisoners; all that should have been saved for a part 3, with part 2 having finished 50 chapters ago.
And unless the final chapter reintroduces Power, Denji's promise to find her will go completely unresolved too. I thought for sure when they went to Hell for that 1 panel a few chapters ago, that was where the story was headed, but i guess not.
I'll have to try bingeing it in one sittng when its done, maybe that'll jog the ol' noggin and make it feel more coherent.